Given how notorious the Chinese government is in forcing local companies to add spyware to their products or store encrypted data for future decryption when quantum computers will become more feasible (e.g. Huawei), how secure do you think their Terramaster NAS products are? Is it worth the cost or is it best to just steer clear of these?
You just need something that can act as firewall betweent he 2 networks, say a Linux box, and then have different SSID for secure and china devices, and VLANs.
OpenWRT is a good thing to have on your APs.
VLAN and firewall are the things to google.