yes, but it doesn't need to be 180 days. Every time you exit Thailand, after staying here for whether a few days, a few weeks, one month or five months, you get 180 days upon each entry.
Are you on soft power or remote work? In my case I wrote "Company Name"*+ remote job, and in address well, the address of my accommodation in Thailand. (My DTV was granted for remote work).
*I mean, the real name of the company I work for like XXXX Korea
Bank interest? Without a bank account? As for a condo, I was told that I couldn't legally rent it, because if so, I'll get Thai income, and it isn't allowed. For shares, yes, even tourists can do that.