If you have a home server and multiple PCs, you can use the free tier to manage them centrally, but be aware the setup might be overkill for just 2 or 3 devices.
ESET offers a free trial version of ESET Protect Entry, which can be downloaded from their official website. The trial version provides full functionality for 30 days, allowing you to test the solution before making a purchase. eset protect entry download free
If you are testing ESET to see if you want to sell it to clients, the free download serves as a fully functional demo/trial. If you have a home server and multiple