I plan on getting 6 of the 0/33s and wondering what base.. now I just bought a boat and it's a triumph so its ropeline. should I go for the economy 4 over the 2 bases? I will not be able to use through bolts. Will screws suffice? What kind or if not what should I use. The extra mounting power of the 4 screws is why I want to go with the 4 base otherwise if I could use through bolts I'd have no problem with the 2.