No, because it needs clearance for the fan blades (see picture below of one type of these displays when it's not spinning). You can kind of see the outline of the circle it makes in the videos, so no, it can't really go much lower. You COULD use one with a 90 degree mount that makes the fan vertical and attach to the side of the mount instead of the top so it went on the top of the head and just slide it forward so it overlapped the front of the head, but then you'd have the black tower the fan connects to sticking up.

The best solution is probably just to paint the base and power cord the same color as the wall it's mounted to.
hologram-fan (resized).jpg

If you can get the blade in front of the topper without touching it.

The newer ones that have plastic enclosures make touching the blade impossible. That's definitely where these are going.

Get something like a $18 meanwell RD35A mini switching power supply and mount it in the cabinet back. It outputs a stable 12v and 5v for pretty much any mod you desire without messing with the power spike uses. Just tap into the 120v where the power comes into the service box, run that to the power supply, and then take all 5v and 12v mod power off that.

https://www.digikey.com/product-detail/en/mean-well-usa-inc/RD-35A/1866-3983-ND/7705982

Depends on the power supply, but the one I linked turns on when power is applied, so you're good to go.

The trick is getting one that has at least two outputs (most are single output, pick one voltage), one for 5v and the other for 12v, so you have power for pretty much any kind of mod you could want as long as you don't draw more than 4A total.

You can easily capture video of the helmet rotating and use that. Have the capture window right around the helmet, and make sure your mouse pointer is below the capture window, then do one rotation with a steady right to left movement and loop that.

https://sketchfab.com/3d-models/the-mandalorian-helmet-1d606adf659849c794a85bca69045c4b

This page has links to the software for all different styles of hologram fans:
http://www.mycaraok.com/apps3d_en.php

This is a popular conversion app:
https://www.xmedia-recode.de/en/download.php

This guy has a general overview of conversion when working with any of the hologram fans on the market:

Depending on the size and style you want, if you're DIY'ing it, you can get a hologram fan for as little as $50 from aliexpress. When you get it, if the fan you choose takes 12v input from an AC adapter, ditch the AC adapter that uses the service plug and make a fused (DO NOT DO IT WITHOUT AN INLINE FUSE) harness that plugs into the 12v on the Spike power distribution board for a cleaner, safer install. I covered how to do that here:

https://pinside.com/pinball/forum/topic/hologram-fan-or-lightedpinballmods-power-fix#post-6241182

Whichever route you go, good luck!

They are loud. Imagine a stand fan on "HIGH" - about like that. You can do cool things with them, but you have to know going in that noise is part of the deal.

It's really disingenuous that these are advertised with the sound taken off the video so people can't hear the noise level.

Someone on youtube posted an example of a random hologram fan they bought and installed, for your reference. It seems more rumbly than the lightedpinballmods one I helped a pinsider install, but a pretty good approximation of real-world noise level:

Here's someone who has made a floating rings video for holographic fans. The file is high res, up to 2160p. You'd need to convert it using the utility that comes with the fans, but that shouldn't be too hard. I'm sure there are others out there like this.

Basically just find video you like and run it through the software converter to make a file the fan can display.

It looks like the OP is selling the pre-converted video clips themed to Deadpool, Ghostbusters, etc to run on the fans so if you just want plug and play, it will cost you.