Do we need to use different airports for border hops with a DTV visa in Thailand?

We're intending to apply for the DTV and then rent a house in Chiang Mai for a few years (kids will attend a private coop group). I understand we need to border hop every six months but I want to know is it necessary to go to different airports so it doesn't look like we're trying to be permanent residents?

We won't stay longer than five years but when I think about it we're not necessarily 'tourists'. Thanks