Ceiling bouncers can be very hit or miss, so if you can't fit in-ceilings and don't want to wear a hardhat in case the duck-taped-to-ceiling speakers come loose, my recommendations in order of descending cost are:
1. Klipsch RP-140SA or knock-offs bought on a certain well known auction website. Hang them on nails or screws just below the ceiling and live with speaker cables running up the walls if you have to.
2. Little Bose or other brand surround speakers mounted on 2 axis rotating mounts screwed high up on the walls, cables as above.
3. Modest (cheap even) bookcase speakers on brackets as above. Cables as above.
Alternatively you could make your own "DIY" Klipsch RP-140SA knockoffs by buying a pair of second hand el cheapo bookshelf speakers, carefully sawing the cabinets and putting your own plywood backs on (which is probably how Klipsch got the idea in the first place). Hang on nails or screws high up where walls meet ceiling.