The best way to find out is to try it. I do it in what seems to be a similar club where the stage is the same height as the subs. I then put the monitors out on the subs which gives more room on the stage. The musicians appreciate the added space and everyone likes the added and evenly spread oomph from the center cluster. Just for grins at one show I did go back to a traditional side subs setup and it sucked. It literally sucked the bass out in the expected lobing zones. I try to center cluster whenever I'm at a venue that allows it. I went a little overboard once and did it on a floor level stage. Sounded great, monitors where great being closer to the musicians, but the band felt isolated from the audience.
There are 2 downsides to center clustering. You losing the nice stable sub boxes to stack the mains on and have to find something else to get the mains up in the air. You also have to play with the main delay settings as you lose the straight forward math of driver offset distance.