Baseboard works great if you either don’t mind seeing the LEDs or provide shielding (can get pricey). Baseboard install gives a nice, indirect, color wash to the walls

Top of wall works great because it removes the LED light from direct view and also allows the entire “band” to be visible if you so desire.

I chose top of wall. I’m about 5” down from ceiling. LEDs sit in a 3” MDF molding I routed using a 1/2” rabbet bit. Dirt cheap mounting method as I just ripped 4x8’ sheets of MDF down to 3” and made nearly 200’ of molding for under $100.
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And... lights off shots

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No problem. Here's are few more images.
Rough cut and routed moldings (before paint)
These MDF pieces were simply nailed to the wall using my Paslode airless finish nailer
I've include an image of he Excel engineering drawing I made before routing them
Also a picture of
I was a little worried about the LED tape sticking to the (very dry/dusty) surface of a routed piece of MDF but they worked great and have stayed down
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Those solutions can work for most folks. Works best for shorter installs. The aluminum channels are a nice clean look too.

I could not use the LED solution because my total run length is nearly 200 feet. When you run LEDs at that distance you encounter voltage drop and must accommodate for it. I ended up running 24 volt LEDs instead of 12 and buying huge (600 watt) power supplies (2 of them). I could have used the aluminum channels but found I could make mine at about a third of that price.

Still, what you shared are great solutions for most game rooms!