I have an XF 280 I run on 3/4” glass and another I ran on 3/4” acrylic. Both do well, but they are rated for 1 1/4” walls
I tried running an XF150 (same 3/4” rating as a 250) on 3/4” glass and it kept falling off unless I wedged it against something else. There was a magnet upgrade kit for a while but it was something silly like $100 last I saw one, so it was worth getting the bigger model.
In short, get the 350 and turn it down if needed. You could also always put on a couple extra of the nem guards they come with to cut the flow down.
I used to run an 180 (might have been a 210, either way 72"x24") SPS tank with a pair of 250s that did very well. The 230 in my 170 on the other hand (60"x24") is about useless. I've seen them do nicely in 50ish gallon cubes.