I use my phone as an extended screen with x11vnc, which works as expected.
The only problem is that I have to change very often the IP address on the vnc client of my phone.
I use a Motorola g turbo Lineage 7.1.2 operating system, rooted.
Is Android able to reserve an IP address, which is possible in a router with Dnsmasq. It basically assigns the IP address and the host name according to the Mac address?