for the 6 months visa u need a bank statement showing u have 9k AUD (not sure euro amount ) in the bank to get accepted plus the address of where you’re staying also you need to do visa run every 60 days the thai embassy in my country (Australia) told me all I need to do is cross boarder and come back again for stamp so I assume you can do at any boarder but I think it’s only okay to do this on a 6 months visa because if u were to do every 30 days it may look suspicious as I have heard and they don’t accept always just what I’ve been told I may be wrong