Alert for keywords ranking position up/down

Be able to create alert via email for keywords ranking position move up to top 10, top 5 or top 3, top 1. Alert for keywords ranking move down to top 20, top 50, top 100 and so on. This is very useful to monitor keywords group rnaking position. The alert will group the keywords have a move up position into top 10, or top 5 and so on.