Yes, I have experience.

Many years ago I helped a huge old house. They had the best success with powerline. At the time Mesh wasn't available.

Nowadays, Mesh has higher bandwidth.

For Mesh, the signals travel through the air and through thin doors and thin walls. If there is something like a hall, stairwell or inner courtyard connecting most of the rooms, then placing the Mesh routers strategically around the hall will be your best bet.

For example, I placed the main router on the ground near the stairwell and the satellite at the end the stairwell where it could service two floors.

The routers could nearly "see" each other through the doorframes and from every corner in the house one router could always be "seen"

If the house is built more like a bunker or maze, then powerline will be your best bet.

In case you go for the powerline route, it will help to know a little how the cables run. Shorter, direct cables are better. One good option might be to place the internet router near the main breaker.