Can’t get head around input voltage and output voltage specs…

I’m looking to install two 100W panels in series to keep the amperage down to keep wiring smaller as well to enhance low sun performance. I have a 12V battery system (2x 12V RV batteries in parallel – yes, I know, crap batteries, but I’ll upgrade later). Can I use this controller to do so:

https://www.renogy.com/adventurer-li-30a-pwm-flush-mount-charge-controller-w-lcd-display/

Nominal Voltage: 12 VDC/ 24 VDC Rated Charge Current: 30A Max. PV Input Voltage: 50 VDC Max. PV Input Power: 12V(400W) / 24V(800W) 

Essentially, I’m wanting to ensure that you can feed about 36V into this controller to safely charge a 12V battery system.

And as a sanity check, when a controller is listed as 12V/24V, that’s referring to the batteries connected, not the panels being fed to it, correct?

Thanks much in advance!

Edit: Also, is it really worth it to skip right to a MPPT controller instead? The MPPT is over double the cost. If so, would this one work:

https://www.renogy.com/rover-li-20-amp-mppt-solar-charge-controller/

Nominal System Voltage: 12/24V (Auto-Detect for Non-Lithium Batteries) Rated Charge Current: 20A Max. PV Input Voltage: 95 VDC Max. PV Input Power: 12V/260W, 24V/520W