I'm new to this forum, so firstly hello, my respects

I am a musician, thinking about a new electronic music show. I would like to have control over my music with Ableton, and several DMX lights (8 to 16 maybe) with an Enttec USB interface.
And I want to work with video too, by myself. I have this idea of using old CRT tvs to display different sources. Maybe 4-8 different screens... I found there were multiples options to do that.
1 - Initially, I wanted to do it with Raspberry pis, with Dicaffeine (https://dicaffeine.com/) which is a NDI player and streamer, or Piwall, which is a similar program : https://crt.gg/piwall. But Raspberry pis are completely out of stock for now, and quite unaffordable, a lot more expensive on the second hand market.
2 - I read this nice topic about using multiples outputs with Resolume : https://resolume.com/support/en/lots-of-outputs but as it brought me a lot of infos, teach me a lot of stuffs, it confused me a little bit more about all that. I can't figure what solution would be the best for me. Two Matrox triplehead, to have six outputs and not spending a lot of money? To build a custom laptop with a Blackmagic quad 2? Or even investing into a more expensive solution, with a Datapath FX4? Is it not too much for 5 or 6 crt? lol.
3 - Using something more home-made/technical, like Arduinos?
I planed to buy a new laptop for this project. I have a 10 year old mac, not suitable for this (sending midi infos, multiples audio outputs, dmx infos + multiple video outputs at the same time...) so I thought to buy a brand new macbook pro 14", but on the Apple website, they say that it can only handle two external monitors... So if I go for the option 2, it's not powerful enought (?)
A newbie with multiple screens project = multiple questions

What kind of laptop do you use for this kind of project? Something you built yourself?
What do you think about all this? Is it a over challenging project for someone like me?
Thanks!