trim tabs on a 23 tsunami

[bobfish21]

Ive finally decided to get up enough nerve to drill holes in my new transom of my 23 tsunami i/o and install a set of tabs.need some input as to what size i'd need,as well as location.do I put them on the extreme outboard deadrise sections of the transom,the middle sections(most likely)or(least likely)on the bottom portion of the hull?leaning towards thelenco electric tabs for ease of installation,but if anyone has had negative experiences with these I could be talked into the bennet hydraulic units.thanks for any and all advise!
also,like to thank those responsible for theboating magazine article on the 73 tsunami-I finally know how much fuel my boat holds.