Streaming with dual SIM/Tailscale/RPi setup

[Avarka]

Hello everyone!

First of all, I'm really far from understanding advanced networking stuff (and this looks pretty advanced to me) so this might be a stupid question.

So, I have the following use-case: I have to build a setup which can achieve as stable connection as possible while travelling or being outside. So my plan is to 2x 5G M.2 dongles (suggestions are welcome) with 1 SIM card each from different providers bond them together using OMPTCPR on a RPi and use the RPi's hotspot to connect to the internet and stream. In this case streaming is live video content (1080p/60fps ideally) from my phone to my home computer though Tailscale (OBS takes care from here).

I'm unsure in a couple of things:

1. The wiki says that connections must have a <500ms latency. Why is that and what happens if one of the SIM cards simply doesn't get reception (eg. because the provider doesn't have coverage)?
2. Can the Raspberry Pi (I'm thinking 4 or 5) handle 2 "outside" connections like that and be able to bond them together without much of a hassle?
3. The power consumption of the contraption is still unclear to me. So if anyone has input on this it is also welcome.

The overall latency of the stream doesn't really matter (I mean as long as it is reasonable - withing 1-2 mins) what really matters is fault tolerance and stability. So if one of the cards doesn't have a good enough reception the stream could still be enjoyable.