The door on the Excluder that is part of the SP30 Squirrel Pack removal system is not spring-loaded, so it needs to be set horizontally to be effective. These will not work if mounted vertically.
The SP30 - Squirrel Pack Squrrel Removal System is a combination of 2 traps: the E30 which is 3W x 3D x 11L, and 2 SPT30's which are 3.5W x 3.5D x 24L. The E30 would fit over the end of the SPT30 . The second SPT30 is a spare that can be used while transporting the squirrels. Unfortunatley, there is not a trap that traps from the top.