My 20' boat is aluminum and there is plenty of room to add permanent rod holders on the sides and/or back. I see that these rod holders can be straight up and down or angled. The angled seems much harder to install (getting the angle right that is). Is there any disadvantage/advantage to the straight vertical rod holder? Or should I consider an angled? Any chance the rods will pop out of the vertical ones when running wide open? Thanks 