The AX1500 costs more than 5K !. I am assuming your budget is abit flexible. With the AX you are spending on wifi too.
Considering the following conditions
1. Power CPU (Recommended for OpenVPN)
2. Giga Router (1000Mbps)
3. Cheaper budget
4. Have another/old router or accesspoint for wifi
5. Ease of use with simple interface (Support OpenWRT)
Given the above conditions and most weight for powerful CPU for VPN. I would suggest going in for an OpenWRT supported router. OpenWRT on a Raspberry Pi 4 along with a smart switch which supports VLANs. You will not get wifi but instead a very powerful and VPN worthy CPU. Budget will also be more than 5K, but still a very big bang for your rupee. Additionally the frequent updates and security from using OpenWRT.
With additional skills you can build your own custom OpenWRT firmware with (pre)configured VPN and other settings, this allows a novice user to simply reset the router to restore default and pre-configured settings. The settings can also be easily backed-up and restored, but a custom firmware image is required to pre-install additional packages like OpenVPN. Do give it a try, cause once you master it, you will be able to configure network like a pro and (maybe) probably never use oem firmware again. The OpenWRT **image-builder** makes it much easier to configure your own custom firmware.
I also noticed your comments on the pihole thread. You can get pihole functionality (ad-blocking for entire network) using the **adblock** package for OpenWRT.