A holder made specifically for your landing nets.  It has an inside diameter of 1.75" (1 3/4"), to accept most net handles.  It is also 10" in length, to hold the net securely.
 
This particular product and it's options, are made for flat surfaces, such as gunnels, platforms, etc.
 
Available in 3 styles:
1. Straight up (90 degree)
2. A 70 degree angle with an In-line base
3 A 70 degree angle with a perpendicular foot
 
Each one of these variants can also be purchased with an aluminum bottom plate and stainless steel mounting hardware, for an additional $7.50
**be sure to select the "with Mounting Hardware" option**
(the picture should show what has been selected)
 
These are made of Aluminum and tig welded together.  Brushed aluminum finish, uncoated.