bound4th, considering cost and flexibility you've made a smart choice.
In my multi subwoofer experience finding your rooms bass modes by placing your uncalibrated sub in the listening position, playing a low frequency tone recording while walking your room and mapping the bass mode areas is extremely beneficial and need only be done once.
By positioning each sub in or about the two most prominent but asymmetrical modes has a huge advantage for the subs to load the room and needing the lest amount of processing and gain.
Let your ears and your personal taste guide your setup as there are no rules. The term flat response is not a goal it's simply a yield sign.
SVS is said to have excellent customer support and suggestions for setting up your presets. Welcome to the deep end.
avatar: Gene Czerwinski