I faced a lot of issues the original suction cup mount which were delivered with the "EHEIM Installationsset 2".
I liked Geooper's idea and redesigned his holder for fitting into the EHEIM incpiria 430 fish tank. I can be clipped inside the tank and is nearly invisible from the outside.
The author remixed this model.
Remixed to fit into the EHEIM incpiria 430 fish tank