I'd start with a dedicated line or two(depends how big a system),one amp,2,3 ect,1 sub 2 subs.
Of course if you are upgrading to a bigger amp(s)that could change on the conditioner you buy.
And of course there is 240v conditioners and 120v sooooooooooo,lots to think about.
For me was my one amp direct to wall,then two more/now I needed dedicated lines,which I should have started with.The lines were all 15a,then I had a 15a torus.
Then a few more amps and realized I wanted to go bal(240)sooo run more wire and purchased a 20a bal and a 60a bal Torus(S)+a dedicated 20a line for one of my subs,the other 3 are connected to the Torus(S).
Nice to have a visual plan as you can see a guy can redo over some of the things you did before
and that goes for conditioners also,which can cost.
So hopefully you can buy once and not buy+sell+buy+sell.
The Torus was my last conditioner stop as they make a huge difference and it's all good,
they are a major component upgrade.