I think technically these are both valid, but I wouldn't complain to a DM that decided otherwise to limit Dash and Hide to once per round.In general, I think the motivation behind Cunning Action was to let the Rogue be more mobile in combat. So you can choose e.g. to be essentially immune to OA, as if you were Disengaging all the time, and still get your action and move, or you can choose to Dash for double movement again without giving up you action. (I don't remember to ever have had a player Hide in combat, so I am not sure how common a tactic that one is).
I don't think that a triple move (move + dash + bonus dash) is a commonly useful tactic, but then it's hardly game-breaking so if it comes up, I'll allow it. Similarly, move + hide + bonus hide is somewhat similar to hiding with advantage, hardly game-breaking either.
Just make sure you don't allow these out of combat however. Being able to take 3 moves in combat doesn't mean the character is straight 50% faster than everyone else while while running or travelling.
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