Yep, but be wary about all of those connections, what type of wall is it? Plasterboard? Usually those modular hdmi plates have a 6" flying lead on the back or if they are just coupler be wary of the size of hdmi connector you will have to plug in.
Too many times have i been to second fix a job and the 1st fixers havnt considered this. One option is to use a brush plate with some braided sleeving and bring the cables directly out of the wall and to the tv, looks neat but its not the best!
Edit: read your post wrong, apologies! Yeah you can do it the way you are planning, i would use the mentioned brush plate/braided sleeving then cable tie onto tv bracket. I initially thought you were using modular faceplates where you but a faceplate shell then the hdmi, coax connectors seperate.
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