Compare set Him, Eph 1:20. Together is ambiguous. Render with Him, as Rev. “Even now we sit there in Him, and shall sit with Him in the end” (Andrews, cited by Ellicott). Compare Rom 8:30; Rev 3:21. Meyer renders hath given us joint seat.
In Christ Jesus
Connect with raised up, made us sit, and in heavenly places. Resurrection, enthronement, heaven, all are in Christ.