Nah....you can never, ever, ever have too many Bettas.
I mean, I don't even really understand that whole thing..too many, LOL.
= )~
Now on the other hand, my Hubby may tell you a different story. = )

Just do like me...get more tanks. = )
Also...if you have tanks that have a cabinet stand...that's usuable
tank space. I have 2 1/2g's (regular shaped, AllGlass brand tanks) in
rows under my 75g. I also had one in the 29g's cabinet.
Kitchen counters are great too. (Hubby put his foot down on that one
when I'm not spawning Bettas, so I only have the 3g Eclipse tank in the
corner of the counter. It was dead space anyway, as it went pretty deep
back there, and nothing ever looked right back there. That was until I
put the 3g Eclipse there. It looks as if it were made for that spot.
Even the Hubby likes it. That says a lot!
However, when I have Betta fry I keep them in 2 1/2g tanks on the
counter for the first few weeks. I like to keep a close eye on them,
watch the temp closely and feeding them several times a day, is made so
much easier when they're right there. Tried it with them inside the
tank cabinet and forget it. Got a "crick" in my neck checking on them
so often, lol.