Yeah HT seats can be a litle tougher tryinhg to get a bunch of shakers mounted to them, or at least I thought so at first. When I first got my seats, I thought I was really going to be limited because I wanted a bunch of them mounted to the seating like you are wanting. But, fortunatly I found somwe ways that worked great and could proibably even put up to 7-8 BK LFE's on my MLP HT seat alone if I wanted from the combo of 3 differnt locations on the seat, and then still have the seat fully functional with thew reclinee mech and all that.
If your seats are anything like mine, you can probably do exactly what I did, at least for your BK's by picking and choosing what areas to mount to for a couple BK's, or use all locatinons if you want to really load up
So, here's the mounting areas that I've found that work great on HT style seating, behind the armrests mounted to a board that just screws into the seat feet threads when original feet are removed, letting the BK's hang out the back, then under the seat with a small mod with wood plank, then to the back of the seat as well, if your into that.
A few pics to give a better idea of what I'm talking about...
Bind the armresrts Canti-Levered:
You can also double up like this for behind the armrests for 4 per seat:
And/or 2 BK LFE's fit pretty darn well underneath the seatimng too:
Here's a pic showing them a little better:
I've got better pics showing the additional mounting piece of wood in there to get them mounted and can find those pics if you need/want them if you decide to go that route. The pics are on my other computer somewhere. I don't run them like this any more though and just have them mounted like up above behind the armrests. Plus now I also run them mounted to the seatback as well, which feels killer and is another way. The multi-location BK LFE combo feels pretty darn wicked!!! I already had the little mounting platform backpack things made to mount a JBL 12" driver to the back of the seats, so was easy to just mount a BK on there as well:
and mounted, giving me 3 BK's per seats ATM, but could easily add 4 more per seat if I wanted
Hope that can help give you some HT style seat mounting ideas. You've got options
If you want them mounted directly to your seating instead of the platform (which I think works way better, at least it did in my case) and your seats are similar to mine (which I bet they are close enough), some or all of these options should work great for your BK's. Clarks as well probably.
As far as the feet go that you linked to, yeah I've used those before. They are pretty hard, but work. Also the older style feet that are used with the Crowsons work too that are a bit softer than those. I think you can get them off Amazon as well. Or the Hudson isos that are used with the BOSS, which are way softer than any of those.