Want to add another temp probe to my Apex

[Reef Pilot]

I have a standard Apex along with an EB8 and I/O Breakout Box. It came with one temp probe, and as I understand it, I cannot add a second to this system without buying an expansion module. Is this correct?

My options then are to add a PM module which costs around 90 bucks, or a Jr Apex for about $150 (which includes the temp probe). But the latter would also give me 4 extra outlets and maybe stave off having to buy a 2nd EB8 in the future.

I have 2 tanks, which is why I want a 2nd temp probe. Too bad the standard base Apex doesn't have a 2nd temp input port like with PH.

Am I missing something? Are there better options?