On my Androids devices, Mullvad (bridged via Wireguard) is running permanently. Then if i need i use Tor Browser Android app which exit via a Tor exit node.Thanks for the replies.
Regarding the last reply are you saying connecting
1) Mullvad VPN => TOR browser (which is not useful since I'm connecting using ExpressVPN/VyprVPN => TOR browser)
TOR browser => Mullvad VPN?
So when i'm only on Mullvad my IP and DNS (based on Browserleaks test) is from Mullvad server, but once i run Tor Browser, they change to the Tor exit node.