Installing Seat Brackets Van Installing A 3rd Seat In The Front Of A Chevy Cargo Van?

Installing a 3rd seat in the front of a Chevy Cargo Van? - installing seat brackets van

I did try a 2001 Chevy cargo van and that a 3rd Place before installing it. Here are my two questions about the procedure:

1. Is it safe?
2. Who knows how and where can I add the brackets and safety?

Thank you!