Shorter Walsh cabinets mean less low end extension. For surround speakers, that should not be an issue assuming bass is handled elsewhere (sub, front speakers).
I think the decision should be made based on utility rather than sound. Wall mounts will save floor space if that is of value and you like the aesthetics. Talls can function standalone in a dedicated music system, but that is not your particular application so it may not matter.
Walsh speakers deliver best/most balanced sound at or somewhat above the level of the driver/can. I would not think you would want to mount Walshes above your listening level in any application.
Also, I think the Walshes are or can be configured inside the can for true omni sound when used for surrounds. Not sure this is beneficial when mounted against a wall. Maybe these are configured differently to emit less sound facing the wall? Not sure. John would be the one to answer these questions.
I think the decision should be made based on utility rather than sound. Wall mounts will save floor space if that is of value and you like the aesthetics. Talls can function standalone in a dedicated music system, but that is not your particular application so it may not matter.
Walsh speakers deliver best/most balanced sound at or somewhat above the level of the driver/can. I would not think you would want to mount Walshes above your listening level in any application.
Also, I think the Walshes are or can be configured inside the can for true omni sound when used for surrounds. Not sure this is beneficial when mounted against a wall. Maybe these are configured differently to emit less sound facing the wall? Not sure. John would be the one to answer these questions.