solo 401k adding spouse to etrade individual 401k

[HJ Wang]

Hello, I have a single member llc and plan to hire my spouse as w2 employee so she can contribute to solo 401k. Right now I have my solo 401k set up at Etrade. I asked me to add my spouse to the plan but they say she has to open another individual 401k. From what i read, one company can only have one solo 401k. So should my spouse just contribute directly to my solo 401k from her bank account? Is etrade's solo 401k set up for the individual, or is it set up for the LLC? I feel like the CS from Etrade doesn't know too much so i wonder if anyone here has similar situation? I see some smaller firms can do this easily but they have higher fee and I need to roll over my current plan to theirs which is a hassle