How to secure solar sheilds?

#1
I don't really know how to secure them
There are many mischievous kids around where the farm is located and it's quite far from where I live. So, it's kinda hard to secure stuff over there and we are searching for people to take care of plants but so far...we haven't been able to find anyone. So, how to secure these solar shields? Any idea? ( from stones and all if possible)