You have to look at the wattage ratings of the charge controllers, and also the max PV voltage handling as well. Battery bank voltage you plan to run at (in your case, 12v), play a role in the wattage rating as well.
Here is an example from a specs chart for Victron 150/xx series controllers:
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You also need to look at the sticker on your panels and find out the Isc and the Voc specs, to figure out how to best wire them (series/parallel or combo), to get your Voc spec up above battery voltage by some order of magnitude, without going over the max PV input limit.
So if you plan to run up to 1260w on 12v battery bank, if we used above example chart, you would need at least a 150/100, and depending on your panel specs, say you wired 2 in series, and those pairs all paralleled, your per panel Voc spec would double, and you check to make sure Voc is still under 150, also checking current (each parallel panel group add to overall Isc), that it doesn't go over 70a...
Not saying you have to go with Victron, but I do like their specs charts showing multiple models on same chart and how they compare to each other. Some of these SCC brands also offer sizing tools on their websites (I know Victron does for sure)...
So see if you can get the sticker specs on your panels...
Also, you can in many cases run multiple charge controllers, but should be aware that you'll have 2 chargers charging on same battery bank, so have to make sure they can play well with each other, so they can optimally charge together without confusing each other... On a simple system, I would rather keep it simple and have only one charge controller (I am not close minded to the idea of having to add one later, but would do so with carefully with monitoring, and make sure they play well together).
