H1B dropbox for spouse and H4 interview for me

[Thisisme123]

Hi,

My spouse is eligible for dropbox and his I797 is approved for his extension and he needs to go for dropbox when he comes to India. We are getting married that time and I need to attend H4 interview.

Can i go for H4 stamping before his dropbox since his I797 was already approved in US?

Also we have booked appointment through our own and not through his employer. Do we need any document from employer stating I would be on H4?