Good choice on the seeds & the breeder.

If it were me, i'd do at least 2. They do say you average 50% males & 50% females under normal conditions, but only 2 seeds isn't enough to play into the averages. You could easily come up with 2 females or 2 males.

I don't know how accurate they are, but if you google it, you can find ways to increase your chances of having females - basically not stressing your plant, similar advice is used to prevent hermies with [URL=/gorilla-cannaibs-seeds.co.uk/feminized-seedsfeminized seeds[/URL].

If space is the issue, many people force their plants to pre-flower so they can tell early on if they're male or female then put them back into veg. If you go with only 2 seeds, that's something you should definitely look into.