Hardware for VPN performance

I'm looking to build a router that will handle VPN traffic and provide good speeds. I currently have a glinet slate 7 and although it does well I'd like to build and tinker with openwrt myself. I am thinking N150/100. Here is what I am looking at. I assume he also need a AP recommendation. I'd like to stick with a small form factor and not need to add devices if possible. I am open though if it's worth it and a clean setup. Budget is whatever makes sense and is somewhat future proof.

https://a.co/d/8gpbHMb

1GB down 40mbps line speeds.