ON the arches they should be fine, but don't use them on the megatrees.
I created 10 groups (of 12 pixels each) on each of my 120 node 1809 flex strip arches. I've never used them as 120 pixels, just because I originally was sequencing them in LOR (using xlights/nutcracker now).
They look good, IMHO, and with 10 RGB segments are easier to sequence. So I'd use them for that purpose.
Be careful in the future to not chase a low price or the cheapest technology of the month. You can easily end up with lights that don't match, the colors may be different for the same RGB mix, intensitys may vary ... just saying, KISS principle is your friend here.