Grandparent looking after 1 year old whilst at work

My MIL is about to start looking after our 1 year old so I can return to work.

For those who have grandparents looking after their children outside the family home, what did you supply them with?

My MIL already has some stuff that we have brought between us over the past year, ie high chair, toys, feeding stuff, nappy changing mat and nappies wipes etc

I’m thinking I need to get a travel cot, blanket, safety gate, safety plugs/corners/door locks, maybe just leave spare clothes round there.

I don’t want to be carrying lots of stuff to hers when she is looking after him and she is willing to have stuff at hers and there is 2 more grandchildren due this year anyway