Using 4 speakers on their own is not really a surround-sound setup.
What are you trying to set up in your basement? Surround sound is usually described as a 5.1 setup at the minimum - three speakers in front, a pair of surround speakers, and a subwoofer.
Do you have your LCR (Left, Centre, Right) speakers and you want to use the DTs for surrounds?
Are you thinking of using the DTs as Atmos channels (probably the best use for them, considering their mounting flexibility)?
Other info like room dimensions, open-concept or closed-in room, display choice, AVR, and your overall budget would help us help you better.