I'd use "kill switch" software on your PC instead, which kills your access to the Internet if the VPN goes down. This way, if you accidentally disconnect from the VPN, your Internet also dies, and it's limited to your computer alone.

This is what I do - I can't use router-based VPN or piHole type stuff because people on my network work on ad-related products or use sites that don't play well with VPNs or DNS-block lists of advertisers, for example.

Of course, you can terminate the VPN software manually and the kill switch and access sites using no VPN if you want, which allows for mistakes, but pretty rare in my experience. Best is to simply have another machine that doesn't have VPN software on it and you use over the naked Internet.

Some reason you cannot setup a Pihole instance and manually configure certain clients to use it and leave the others alone?

I've tried this with split tunneling and other methods and it doesn't work quite right for some reason.

How do you use two VPNs without router or piHole? I need my pc -> company's VPN -> Mulldad VPN -> Internet

I would not recommend doing that, you will need to be able to selectively turn it off or change it sometimes... VPN blocking is unfortunately becoming more common among popular services. I have to disable or at least switch servers quite often to access popular services.

Also if you are new to the game, make sure you use wiregaurd, it leaves the large complex VPN protocols of old in the dust. It adds almost no latency to my connection, sometimes speeds things up.

That’s why you create 2 wifis each one on it’s own VLAN, one with VPN on and one off. You can then switch wifi to get off VPN

Thanks. I am still figuring out how all of this works. I have work VPN but I want to use USA VPN too.

You've probably heard about them a lot on HN but i'd recommend Mullvad, they are also big on wiregaurd, lots of servers, lots of countries, well known for privacy focus... i don't even use their app, just download the wiregaurd configs and use wg-quick to bring them up from the cli, been using them for few years now I think.