I’ll start by stating that there are many types of mounting systems.
The most common is a flange with a pipe attached (screw on or glued) that goes straight down into the holding tank. (how it goes into the holding tank is a whole different issue).
The flange is screwed to the floor. Some flanges are slotted and will allow about 10% turn but the bolts really should be all the way on. Then there is a gasket between the bowl base and the flange. You MAY be able to unscrew the flange and turn it 45% then screw it back on. I suggest that you exercise great care if you try. You do not want to pull the pipe out of the tank or break the collar/seal.
‘18 Sunseeker 2800QS