Spousal owned single member LLC for consulting. Only employee is other spouse working as a 1099

My wife started an LLC since she consults for several companies. I retired from full employment and will work as a consultant to my former employer as a 1099. We have discussed having me as the only employee of my wife's LLC and my former company is a client of the LLC. What information do I provide my former employer on a W-9? Do I list the LLC's EIN, my SSN? Can't find a clear answer. Ultimately, we want the LLC to be the supplier of services to my former employer. I just happen to be the "staff" assigned to their account.

The LLC will then pay me a "salary" and issue a W-2.

 

How is this best done?

 

Thanks for your help.