Seems like getting a residence certificate is becoming more of a challenge since my last experience maybe 6 years ago. My recent experience in Chiang Rai was similar, filed TM30, recent entry stamp and visa, landlords house book and ID, and house book of my rental property. No fee asked for, wait a week.
A visa only shows the purpose of your visit. If the immigration officer isn't satisfied with your answers regarding the reason for your visit you can be denied entry.
You apply as spouse and reference the primary DTV holder visa number, prove marriage, show your 500k funding and pay the application fee. You will get your own visa as spouse.