I'd put it in a middle egg box. Just label it so you don't forget and pull the probe out with the box.
I would personally do it against the middle wall. This way you dont have to remember what tub its in and if you choose to seal it you dont have to worry about that
1.1 Het Albino Ball 1.0 Spider
1.0 Mojave Ball 0.1 Pinstripe
0.1 Honey Bee 0.2 Normal
1.0 Caramel 0.1 Mojave het Caramel