Which silicone heater? and Board?

[iamthebest22]

So I've pretty much had it with trying to solder the heat bed, and I know I've asked about it, but thought I make an entire new one for people who might have the same question in the future, and also asking about Boards. Is this heater too much? https://www.amazon.com/gp/product/B0...1B1WAQGO&psc=1 it says 120V 750W, does that mean it won't work with 24V power supply, does it need to be a 220V like this one? https://www.amazon.com/gp/product/B0...1SM8KTJ&psc=1? Also Does it need to be a 300 x300? (it would be sticking underneath the mk2a aluminum bed, which is 315 x 315mm).
EDIT: Update on the silicone bed, so 220V and 120V is for Solid State Relays, so this one will work with my 24V power supply? https://www.aliexpress.com/item/30X3...e-b5ac199315c8
or this one because my 24V is only 500W and this will only leave 100W for everything else. While this one will leave 200W ish? https://l.facebook.com/l.php?u=https...IQpeihoM5p08x_

About the board, I just bought a Duet Wifi for my HEVO (Hypercube Evolution), and I'm getting the Tronxy X5s soon in a week or so. I want to replace the board on that one but I want to try something other than Duet. I'm looking at a cheaper option but I'm thinking of RUMBA 8 bit board. Anybody used that before and what do you think about that one? Here's some info about the RUMBA http://reprap.org/wiki/RUMBA. Thanks again.