Hi? i am having a problem installing smart tabs on my 18ft 1995 bayliner capri boat. rear end of the boat doesn't have enough flat surface to mount them. espcially when i measure 3" in from the portside. the smart tabs will not be on the same surface or plane. what am i suppose to do? has anyone had this problem and how do you went about to get them installed? pls help and picture will also help and measurement. thanks also.