L1, L2 Visa

Dear learned community members, trust you all are doing well.

My wife has her L1 B (specialized knowledge) visa interview scheduled on 3rd Jan in Chennai and I would be her dependent L2.

I would be highly obliged if you could answer the below queries that we have:

1. After reading through more than 700 interview experiences, I came to realize that if you mention about sitting at client location /or doing work specific to a client on L1B, the chances of rejection becomes very very high.
In the L1B petition of my wife filed by a leading technology MNC, it is mentioned that she would be working out of Client location. They have also mentioned in the petition that while doing so, she would be under direct supervision of the Petitioner itself.
Does this in any way help us?

2. My wife has developed a proprietary tool for this technology MNC. But in the answers , we are saying that she is going to US to customize that tool for client and all our answers then automatically revolves around the client. I am not sure if this is correct or not. Request some seniors to guide us whether we should mention about the client or not as in the petition it has been mentioned that she is going for client work.

3. My wife's surname before marriage was 'X' which is also mentioned in her Passport.
But by mistake in the Marriage certificate, we wrote her surname as 'Y' which is my surname. But in the MC, her fathers name and her permanent address is same as passport.
Now will it create any problems for the L2 dependent. We do not have the time for changing the names in the passport or marriage certificate. Could you please suggest an alternative for this?

I know am asking too many questions, but would be grateful if someone could help me answer this as the interview date is just knocking on the doors and we are getting tensed.