We have a few of these at work. The vertical mounts are removable/adjustable, but the bottom horizontal is welded to the rack.
We have also been using Tripp Lite patch panels and have had zero issues with them...
GOG is not a replacement, it just helps you see all your games in one place. It still uses the native launchers for each game.
I've used it since it came out of closed beta. The only real issue I've had is every now and then it will log me out of all my linked accounts (which is annoying to log...
I have a i5-8400 and a 1080ti founders in my sff, with a 450w. I don't have issues most of the time, but it does stutter when I play more GPU heavy games.
Espire looks like it could be a lot of fun, I'll keep an eye on it for when it launches.
I enjoyed the first one, but took a bit to get used to the controls.
I have 9 in mine too, but only 6 are RGB. I used this for power https://www.amazon.com/DEEPCOOL-FH-10-Integrated-Occupying-Motherboard/dp/B077YHLDSP and the Commander Pro/Lighting Node Pro for the RGB