I've gotten this device for both my RAD bikes. It allows you to have 2 mounted below the handle bars on the sides. With long enough bolts and good eyes, it can be "co-mounted" with the front basket or bracket. Sturdy. Works well...
From your friends at Amazon:
Cascade Manufacturing Bottle Cage Mounting Bracket for Rad Power Bikes
Brand: Cascade Manufacturing
4.5 out of 5 stars 83 ratings
Price: $29.99 & FREE Returns
Color: White
Black, Orange, Stainless Steel,White
Material Aluminum, Stainless Steel
Brand Cascade Manufacturing
About this item
Light Weight, Easy to Install, Made in USA
Includes 4 screws for installing bottle cages
Easily route your cables behind the mount for a clean look
White Powder Coated 1/8" 6061-T6 Aircraft Grade Aluminum
Compatible with Front Rack. Bottle Cages Not Included