Protocol is separate from IP type
SOCKS5 describes how an application connects to a proxy. Residential, mobile and datacenter describe the network behind it. Choose the network for the task and confirm that your chosen plan and application support the required protocol.
Configure all connection fields
Use the correct SOCKS host and port, then enter the supplied username and password where supported. Some browsers handle SOCKS authentication differently from desktop applications. Check the client documentation before ordering for a specific tool.
Check DNS and transport requirements
Test the actual application, not only a browser IP page. Do not assume UDP, remote DNS or every destination port is supported. Support can help confirm the required combination before purchase.