Simple bolted connection BCs

Hello,

I would like your expert opinion in applying BC in a problem similar to the one found in the attached file. Two solids are connected to each other with bolt connections as seen. Solid 1 is loaded to the side. The load seen is arbitrary; It can be forces, moment or a combination of both.

If one was to model only solid 1 (not both) for a static analysis and for the sake of simplicity didn't wish to model the bolts or make a contact analysis, what will be the best approach for applying the constraints? a) constraint in the x,y,z direction the bottom surface* (surface in contact) of solid 1 or b ) use RBE2 elements to simulate the bolts and constraint the independent (central) node in the x,y,z)? Any other ideas, best practices? 

Thank you.    

*: Meaning the line boundaries of the surface (3D elements...)

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