We have Hyd slides so I'll leave that question for someone else.
As far as adding the second AC unit, it is installed above the bedroom with no intrusion on the inside. We didn't have a fan in the bedroom when we had the 2nd AC added. They did have to order a plenum from DT to tie it into the duct work once they cut out the roof and installed the unit.
If you have a fan there, maybe it isn't where the AC unit mounts, possibly just ahead or behind?
Cheers,
Bill
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