I read in this CDE application guide and this Nichicon application guide that if a screw terminal electrolytic capacitor is installed upside-down, the vent may not function properly and the electrolyte may leak out. Proper orientation is upright, or horizontal with the vent at the top of the capacitor.
Smaller electrolytic capacitors often do not have such a vent, instead having a scored top.
I don't see any reason to expect a problem in this case. Is there any restriction on the mounting orientation of this style of capacitor?