The recessed center you linked to would seem like a better choice if those were your choices. Why would you get different models/types for L&R when compared to center? Match them across the front, all three LCR's, and I'd angle the L&R toward the primary LP as well.
Also, once installed, experiment with the audible effects of the grill, on and off. If the grill off is preferred and aesthetically acceptable, go with it. Depending on where the LCR's are placed, front wall SBIR attenuation could be extremely helpful for center channel clarity and overall articulation across the front. The manner in which a loudspeaker interacts with the adjacent sidewall-front wall boundaries can cause significant nulls in response. These effects can be mitigated by either placement, or attenuation of the energy to the rear/side toward the offending boundary.
Here's a brief tutorial on SBIR from AVS'er Paul Spencer from his excellent blog; Red Spade
Here's another from HTS; Home Theater Shack