I have currently have an Archer AX3000 for my home network. I need to expand this network a little. I have an AC1900 that I am not currently using. Can I use the AC1900 to expand the network safely?

I was talking to a rep for TP link and was given a list of routers that have the built in VPN function. I forgot to copy and paste it so I could look at buying one. Can someone provide a list of the r