Is it fine to accept two offers at once?

I don’t intend to work in both the companies.

I have accepted an offer from Deloitte. Joining date is in October.

I now want to accept an offer from another MNC with joining date in late October, just in case Deloitte withdraws the offer for whatever reason (found cheaper replacement, etc).

Would it be safe to accept both the offers, and then reject the second one if I successfully join Deloitte?

Will it be found out in BGV that I have accepted two offers, and they’ll reject me?