If you are going to use borates, then yes, 50ppm or above would be the ideal amount. ProTeam Gentle Spa is the only one I am familiar with, but I am sure there are others. In my opinion, a total alkalinity of 50ppm is on the low side. I prefer at least 70-80ppm. Most chemical manufacturers and hot tub manufacturers want alkalinity between 80-120ppm and some, like BioGuard, prefer 125-150.
I would do borates before pH and alkalinity as not all borate products are pH neutral.