Any small Windows PC can be used as a RoonBridge if you didn’t want to put your laptop there. Several are on sale at Amazon for about 180usd which includes the Windows license.
For just running the ASIO drivers and RoonBridge, something like this would work:
.https://www.amazon.com/Fanless-Desktop-Computer-Windows-Mounting/dp/B07QY8LDGX/ref=zg_bs_13896591011_3?_encoding=UTF8&psc=1&refRID=7K162TEK98Z42DRHW436