I have had various sticks and Roku highest end models and then got the latest ATV with hard wire port that adds Dolby vision and high frame rate HDR. I have a 2022 high-end TV.

The video quality is noticeably better. Not sure of older ATV, but this is clearly better than the top end Roku. Also, I’m not sure if it is the same on older tvs

The other thing is that you want to hard wire if at all possible. Even the best wifi can’t touch the reliability of a wire

Seems like your edge server is acting as a proxy for a media server on some other host on your LAN.

You want to make sure that the media server software is setup securely, patched, and properly isolated from anything else in LAN should that become compromised. Proxy closes off a lot of attack vectors but not application vulnerabilities. The Lastpass hack happened because of some vulnerability in an employees home plex server.

UPS batteries are really dangerous because you cannot turn them off. They are also high enough voltage and current to harm you through arc flash and burns.

The other thing with small UPS batteries is that there are usually multiple batteries. There are fuses between the battery string and the circuit board but not between each battery in the string.

OP may have connected batteries wrong or he put a new battery in a string with a shorted/dead battery.

Whenever you are going to string multiple batteries together always disconnect batteries and check voltage on each separate battery to make sure that they are the same or very close in voltage. If different charge to the same level. Any difference in voltage between the cells will cause current flow that can cause a fire hazard.