When you use parallel wiring you can theoretically add as much as you want.
Lets say you use an HLG-150H-48 (3,15A) and 3 double row F strips connected in parallel. Each strip would get 46v and 1,05A and run with ~50w. When you add another strip the driver current(3,15A) is divided by four, each strip gets only ~790mA and will run at ~38w. Still 150w total but efficiency goes up from 170lm/w to ~177lm/w. The lower the current the more efficient they will be. Add a 5th strip and each strip gets 630mA and eff. would be ~183lm/w. With 6 it would be 525mA and so on. No need to mention that the cooling effort is much lower with less watts. You can glue the to grandma's backing pan or an simple alu sheet. I prefer alli c-channels. Bridgelux EBgen2 series can run completely without heatsinks, high powered F-strips(+700mA) need at least something like a backing pan to keep them cool.
With series connections you need to use as much voltage as possible. An HLG-185h-C1050 has for instance 190v and a constant current of 1050mA. The current is okay for double row F-strips but you need 4 strips to use its full potential(4x 46v= 184v, 6v headroom). If you add another one it would start blinking because of its over voltage protection. And its minimum voltage is 95v so two strips in series is the minimum but you would only get 100w instead 200.
Parallel wiring is more flexible and al!ows you to increase the efficiency later by simply adding more strips. And this could be cheaper than buying newer generations to interchange them against the old ones. My 20 single row F-strips(nom. 1120mA) run only at 450mA now, ~190lm/w according to Samsung engine calculator. Thats ~2,75μMol/j(w) and ~2,55 system efficiency.
