I have two but not much experience with either.
I have 10' on a 33 and a 12' on a 44' cc.
One year I tried to lash it to the rear life lines on the 33 but it got in the way of the winch
handle and I couldn't see over it so I felt like I was in a cave.
It is stored on the forward life lines now, kinda laying down on the deck
. I didn't have the boat out this year. The 33' doesn't tend to take water
over the bow so I think that may work.
On he 44 it is right against the lifelines
forward over the spinaker pole. But I have not had the boat in any kind of weather
it being new to us. This boat is a bit wetter (I think) so the location may be an issue.
I find the damn seats are more of a problem. On the 33 I put in tie downs on the wood of the companion way cover and they are there. On the 44 we have them lashed to the aft life lines with paddles bungied to the wind generator
pole. We are going to get an arch and/or hard bimini
and will design that to accommodate the porta bote.
A word of warning, I find they tow poorly. They tend to dig in their bow and fill up. I asked the company owner and her advice is to pull them up right tight, with the bow almost out of the water. That seems to work much better but I don't have enough experience yet.
Good luck, I'd be interested in what you finally do.