Just be really careful with anything that is suctioned capped to the wall of your sorority. I have some 4L mesh breeders' nets that I use to house fish in tanks. However, I have noticed that the suction caps on these are very poor quality (these weren't the cheap option either) and usually stop actually sticking to the glass after a while underwater.
I came home once to find one expensive HM male dead when the suction caps holding the net in place failed and he fell into my sorority. I'm sure they had a great old time tearing his fins off.
After a couple of near misses I stopped using them as I was too afraid another fish would be injured or killed.
I have the Satellite breeders' box you linked to, and it is pretty small for a permanent home for a full-grown betta. Plus I found it to be very noisy with the water pumping in and out. Otherwise I didn't really have all that many complaints about it.