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If this is for your 10g tank, then probably. IME, 2 otos in a well established 10g are fine. Not all bettas like roommates though, so make sure to have a back-up plan if the betta doesn't get along with the otos.
I personally wouldn't stock otos in a 10G, but it can be done if they take to supplemental foods. Bettas are all individuals. I've seen bettas that hunt and kill anything and others co-exist with fish you wouldn't expect them too. Like AA said, have a backup plan.