Ok,
That is a basic one and the contacts are rated for 15 amp (resistive, which is what you will be doing with it)
You can cut the end off of an old multiple ended household type lighting extension cord and plug both heaters into it.
The only thing you should be aware of, is that all the Ranco sensors are not to be immersed in any type of water at all, these are made for sensing only air temperatures.
If you want to sense water, then a “well” would be placed in the water and then the sensor placed in the well.
You can get 1/2” clear pvc heat shrink tubing and cut it to a height higher than your tank or sump (wherever your putting it) then heat up the bottom of the tubing gently, pinch that end closed and wait for it to cool before releasing pressure. Place the tubing vertically in the water and put the sensor inside the tubing (objective is to have the tubing water tight and with the sensor inside the tubing never getting wet)
Alternative to this is to just coat the complete sensor and wiring in clear silicone so water won’t be in contact with any of it.
If none of this is done, the sensor and wiring will deteriorate and need to be replaced eventually.
