It would be cheaper to put two probes side by side.
However they do make items like the stoker Stoker
which allows the use of a "Three Port Expander". Plug this 3-Device Port Expander into your Stoker to give you a total of 8 Device Ports. Multiple 3 Port Expanders can be used on one Stoker. Blowers cannot be used on expanded ports.
I am sure there are many others out there, but this is the one I have researched because it fits my needs.