How to safely store a hybrid car for extended periods in Sri Lanka

My dad has a Nissan XTrail Hybrid and it is now parked at my parent’s home for weeks due to Corona lockdown curfew.

Also my wife’s WagonR is also very rarely used now since she works from home.

What are the measures we can take to maintain these hybrid cars safely for long time like this?

Currently we only start the vehicle for awhile few times a week. Anything else we should do? Will there be any adverse impact from the current hot climate to these vehicles?