Yep - no problems and i figured youd need a few. I had a 500W Jaycar one that i ran 4 woodrails from and have put 100W stepdowns into machines before but they can be a bit sluggish. 200W runs them OK...300W gives you plenty of power to spare.
In fact Mike would be the one to talk to about an amount of these.. he is right in the thick of the area this sort of stuff is made and his staff could source for you. I use Mikes services a lot and its been a lifesaver for me several times for both sourcing, handling, quality control and shipping.. stepdowns??? Suprised he's not offering them already