Razza, you will want multiple mothers for a couple reasons- efficient use of space, possibility of losing one or more to diseases, etc.
I'd keep 4 big short wide moms in 5 gallon buckets under a MH 400, or a 3x3 tray of smaller moms in quart pots- this raises your plant count, but you can sell or flower them when they are ready to retire, and if you have to move your grow, it's much easier.
I like to suggest that people keep moms in my compost mix even if they are hydro growers, just because there is so little that can go wrong in compost, and your mothers are your investment!