If possible, I try to guide guests to seats that are readily (and willingly) amde availabvle to newcomers, and that the only person in the room that has a mokom kavua (which is non-negotiable) is the Rabbi.
The other idiots that will ask you to move from their seat (and we have a few), are not members of our shul…. they are members of Anshei Middas Sidom, and just pop in here once in a while.
But you’re best off not sitting in their seat anyways. What they have might be contageous, so play it safe and sit elsewhere)