Mine was mounted horizontally (to keep it more tucked up and out of the way).
Yeah, it's a bit more of a pain to change the first time, but eventually you work out a procedure and, after that, it's no biggie.
Drain sump first. Position catch pan under filter. Slowly loosen until dripping starts. Wait for dripping to stop. Unscrew the rest of the way, holding filter horizontally as you pull it free. No more oil will run out unless you tip the open end down, but you do that into the catch pan.
Harder to describe than to do, but bottom line is it's easily done with a minimum of spill.
Not a reason to avoid mounting horizontally if that works out better for other reasons.
I'm reminded of how hard it seemed removing idle jets on Webers the first few times. After a while, you get the hang of it, and it becomes nothing to stress over.
As a species, we have been solving problems like this for millions of years. This is far easier to master than using a ketchup bottle.