What size is the building then we can talk spacing. ideally 5-8 between tournament tables anything under 4-5 feet you keep running into each other playing.
4-1/2x9= 14-1/2x19 with 5 foot of clearence between walls and poles. Remember you are using 58" cues so if the cue ball is on the rail versus the center of table you need X #of feet in clearence.
Sketch it lay it out draw it and play with it I perfer tape on the floor for lay outs.
Craig