Ground feeder trays

Hi, just joined this forum and have already found loads of advice and answers to problems I have had. 

I am wondering if many people use the trays for ground feeding birds and whether they are worth getting,  I have a mesh tray on a feeding station pole and it seems to get clogged up and water-logged.  Would the same happen with the trays?  Does anyone have any ideas for making one?  Great to hear your views.

December 21st is a great day - the sun starts to come back to us and spring is in the air!