I used a parallel board more with my quads, my various planes all have different size/types of batteries. Even with my quads I don't parallel that often. I just don't got that many batteries.
If you're gonna parallel charge, be safe and pay attention to what you're doing, and thst all the batteries are within a safe voltage range of each other. But it depends on how many batteries you have if it's worth it bothering with it...
As for power supply, I got a cheap server power supply off ebay for like $20 and modded it to have an xt60 plug come off it. There are various articles/videos out there on how to do it. Isdt also sells a power supply for their chargers, but the server PSU route is definitely a lot cheaper.