help with mariadb galera cluster

Hello MariaDB experts,

I need some help to install and configure a three nodes MariaDB Galera cluster
on debian 10 or 11
from scratch.

I've followed several tutorials but I'm always getting an error.

The topology is simple and I need only one master node
with *syncronous* replication
and it needs to be rock stable.

If you prefer a multi-master setup
you are the expert and I'm fine with that.

Max 100 euros.

Please bid only if you have experience with the topic.

Thank you.