All very good questions. I to use a similar product. While your router can certainly handle the bandwidth of all these devices (next to 0) you have valid concerns.

Before I get to crazy, are you able to explain your current network setup? What type of equipment you have, etc? I only ask because im going to make a suggestion, but dont want to make one that will overwhelm you.

I will say this right off the bat, they make power strips with multiple outlets, and each individual outlet on said powerstrip can be individually addressed. May save you some money, and additionally, keep the ip addresses to a minimum.

amazing gameroom! i dont want to reinvent the wheel for you but the main concern seems to be covered. just wanted to make sure you werent using some isp supplied router, haha. i use these with the smart LIFE (not things) app. works amazing, and each plug can be controlled individually

https://www.amazon.com/TECKIN-Multiple-Protector-Bar%EF%BC%8CRemote-Compatible/dp/B07FM3P87S/ref=sr_1_9

personally, I setup routines to which you can add siri, alexa, etc commands to. so for example you can assign a plug to ghostbusters, and tell siri to turn only that game, or a group on, and itll work.

i think you are set! my only concern, and maybe someone more educated than I can chime in, is what happens if one of these companies goes belly up? For example i buy smart plugs from brand x, brand x goes out of business, do my smart plugs still work?

i mean someone is housing the servers that run the api, etc. to allow it all to work together. that (to me) is more concerning than the actual hardware failing. my hopes is im missing something, and itll work forever, haha.

wish I would have researched more. im in IT but the amount of options is just ridiculous. love what you guys are saying about essentially an open source device that isnt dependent on cloud. my stuff works great.... but who is to say company x stays in business. i fear one day everything will just stop working.

The wifi thing sounds like a router restriction rather than protocol restriction. Ill read up on zigbee.

That is so damn satisfying to see! I bet you were holding your breath waiting for those last couple machines to power down, haha. Great work