Please help me add 2 Dolby Speakers somehow

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If you only have a 5.1 setup, you should be using the two speakers behind you as surround speakers (to the left and right of you) and not rears, which only come into play on a 7.1 setup. Also, if your rear speakers are near the ceiling then that won't really work with Atmos since there won't be enough separation between the two.

Ideally speakers for Atmos should go above your head, but if you can't do that then using them as front heights right under your ceiling would also work. I've tried both and there's really no substitute for having overhead speakers. Regardless of what you choose to go with, I would lower your rear speakers though.