Your rack is definitely on the very flimsy side, I would not load the top up anymore because the uprights will twist and fail, bringing the whole thing down like Jenga.
Looks like a Chinese version of a comms rack.
If you have a a thunderbolt 3 port available you could get either a Sonnet or a QNAP adapter.
Both use the Aquantia chip (now owned by Marvell)
I can confirm the SFP-10GSR-85 model works with Intel and Ubiquiti gear. OM3 LC/LC runs up to 65m no problems here. Have not tested longer runs but whatever they are rated to they should do no problems.
I use an APC 1500 with 2x 100amp SLA batteries in series (24volts). I get about 1.5hrs out of it before low battery shutdown. Been using this setup for 15 years with no issue. If you don't want to cut holes in a brand new ups, I took the front off the ups and connected the external batteries...
If I was doing this and I didn't want to spend the $$ on server grade motherboards, I would get a KVM over IP device and if I wanted power and reset control, I would use an hobby grade micro controller board such as the ESP32 or an Arduino UNO with Ethernet, write a program to accept remote...