Great question. The good news is you should have no issues sourcing products for your store from two separate dropshipping app. Each product you add from the apps will be connected to the supplier and fulfillment settings.
The only thing to note is that if a customer bought an eprolo product and an oberlo product, the order would come in separate packages. This is due to having different suppliers, they will be shipped out at different times.
If there is anything else I can help you with, please let me know.