If you have 6” of width per tube you could mount up to 6 strips per tube. The strips are about 20mm wide if I remember, if I’m off it’s not by much. They’re definitely less than an inch wide. But I would think that would be overkill. Three per 6” piece is probably on the upper end of good in my opinion. You have room to fudge it one way or the other if you need to squeeze an extra strip in or take one away to fit drivers properly.
I think I said one of those hlg-185’s would fit 9 of the 560mm strips very well. So if you put three pieces of tubing together and three strips on each piece of tubing, you could run that from a single driver for about 200 Watts. And then you’re saying you’d like three different fixtures like that?
If I misunderstood please say so. Just trying to make sure we’re on the same page.