You can rely upon guidelines issued by govt for posting husband and wife at same station
Posting of husband and wife at the same station
F.No.28034/9/2009-Estt.(A)
Government of India
Ministry of Personnel, Public Grievances and Pensions
(Department of Personnel and Training)
North Block,New Delhi,
Dated the 30th September, 2009.
OFFICE MEMORANDUM
Where one spouse belongs to an All India Service and the other spouse belongs to a Public Sector Undertaking:
The spouse employed under the Public Sector Undertaking may apply to the competent authority and said authority may post the said officer to the station, or if there is no post under the PSU in that station, to the State where the other spouse is posted.
(vi) Where one spouse belongs to a Central Service and the other spouse belongs to a PSU:-
The spouse employed under the PSU 'may apply to the competent authority and the said authority may post the officer to the station or if there is no post under the PSU in that station, to the station nearest to the station where the other spouse is posted. If, however, the request cannot be granted because the PSU has no post in the said station, then the spouse belonging to the Central Service may apply to the appropriate cadre controlling authority and the said authority may post the said officer to the station or if there is no post in that station, to the station nearest to the station where the spouse employed under PSU is posted.