Advice on renting out Property in Poland securely? (without being physically present)

I would like to rent out a warehouse in Warsaw to store some of my personal belongings.

the next weeks I am on holiday and will not be in Poland personally.

is there a way to rent out property (warehouse) if you are not physically present?

is there a safe anonymous way to rent out property (theft prevention)
nominee,...

any advice?

You can conclude lease contract via mail or just give somebody a power of attorney to do this on your behalf. You can use security agency as well to protect your staff.