None of the fasteners or hardware are really designed to fight gravity. When you’re mounting gear vertically, it’s best to let Gravity work for you when securing equipment to the wall. I wouldn’t vertically install a UPS at all. I’d get a floor-standing unit if I can’t have a horizontal rack even if I have to install L-brackets for a small shelf for the pedestal UPS to sit on.
I’ve had AT&T Fiber in two different cities 360 miles apart and neither location had CGNAT. The AT&T Gateway isn’t the greatest, but it can hand off the WAN IP to your own router, but you’re still confined to the AT&T Gateway’s tiny NAT table. The extra upload speed is no joke. I also Work from home and I can upload files to the company Google Drive faster than I can when I visit an office. You can ask AT&T for static IPs still I believe, but at my last place the Dynamic IP didn’t change in 4 years.
The service has been quite reliable. I have had one 2 hour outage after a windstorm in six months. I live in an older neighborhood where telecom and electric are all above ground in the alley.
Man, I miss my days of being a sysadmin and in charge of decom at a company that treated homelab as a perk. Once the NBV was $0 if it didn’t go home with me it was going in the recycling truck. The only things we tended to sell were the big decom projects with blade centers… which I don’t want. We once had a decommissioned silicon emulator sitting out front of the building overnight because my purchasing rep forgot my building in another state didn’t have a loading dock. Freight company had to come back with a lift gate.
I’m rolling Ubuntu with docker. Still run some VMs for experiments via QEMU. My 1U server in my rack is running Server 2019 that has stuff I like to keep running as much as possible. The 2U on Ubuntu has been a bit of a pain in the ass to reboot. It often won’t auto-import my ZFS pools on boot. Does it manually every time though.
Bear in mind any PoE powered 10gig switches won’t have 10 gig on the PoE In port. You’re going to eat two ports on that switch. One for the power only and one for a 10Gig uplink. Also make sure you either have Spanning Tree enabled or have all traffic blocked on the PoE link… you’ve created a nice bridging loop.