Posts in ground, top of slab, through slab?

I'm thinking of having a stamped concrete patio poured in my backyard and would like to install a suspended bench/swing off to the side (facing the patio). My plan is to use two 6x6 treated posts connected by a couple horizontal 2x10s overhead. Question is, should I install the posts in the ground just past the edge of the patio, on top of the patio (embed J anchors then metal post bases), or through the patio (have the contractor pour up to the posts with fiberboard around the post for expansion/contraction? Or none of the above? The first sounds like the most solid method and I wouldn't have to worry about cracks forming in the slab like I would with the third proposed option. The second option doesn't seem like it would be strong enough to sustain the forces imposed by a swing with two adults on it.

 

Skip the posts. Suspend the swing from an A-frame resting on the patio.
Google "swing a-frame" for ideas.

 

If you go through the slap make an opening where the post can pass through without disturbing the slab. You can always fill that area with gravel or even a thin pad that could be chiseled out if something needed to be replaced.

 

An A-frame would take up too much space. If the options I mentioned won't work, I could forego the swing and hang two egg seats.

 

I vote for option 1. Then if it ends up not being used or if you want something else it does not bother the patio.