These inexpensive biminis have aluminum
bows with the upright supports telescoped into them, and it's fairly easy to cut down the uprights a few inches if necessary.
The bottoms of the uprights have pressed-on plastic fittings, so -- if you cut them down at the bottom -- you'll have to replace the fittings with ones that have setscrews. If you cut them down at the tops of the uprights, you'll lose a spring-button release that makes it easy to disassemble the uprights from the bows. If you plan to leave the bimini
permanently installed, that is no big deal.
I have one for my catboat that I cut down because of the cat's low boom. I remove and stow mine when not in use, though.