Can we apply for another 60-day e-visa in Thailand before the first expires?

Hello, I have some questions about 60 day tourist visa . Me and my wife will apply for e-visa in Finland and it looks like all process should be completed online. Before our visa expires we will apply for 30 days extension but after that I understand we have to leave the country. My question would be while we still in Thailand can we apply for another 60 days e-visa online ? So when we fly out to any near country we can come back with another 60 days visa. My wife is Tanzanian citizen but Finnish resident so when I check online it show apply for visa available.

And another question if we get e-visa approved in case if land borders open can we use it for visa run or it's should be used only at airports ? Tanzanian citizens are mostly visa free to travel to countries around Thailand or should apply for evisa.