All our extensions are created with the best store platform practices in mind. They are of course oriented on default platform template and there's no way our products could be oriented on a variety of custom themes/modules available on a marketplace, which is why we can't guarantee any of our extensions would be compatible with custom themes/extensions developed by someone else.
If you're facing any compatibility issues after installing our extension, just ask for assistance! Purchasing "Installation" service will cover resolving conflicts between our extension and your custom theme and/or module.