Is this an attachment to add to a base keyboard stand we have to buy separately or is this one product as pictured ?

Good morning yes, the Onstage KSA8500 2nd Keyboard Tier add on to your Keyboard Stand give you a total mount 3 Keyboards or Drum Machines. We have this item in stock with a discount and will ship today FedEx. ABR-MusicVideo PH: (262) 632-9222 www.ABR-MusicVideo.com

How do I keep the stand from falling over after attaching this? Even before I add the synths, it'll make the stand fall over and especially after.

My stand was a proline double x didn't have a tiping problem. I would not recommend buying the ksa8500,l had to modify mine to suit my needs. not as universal as they advertise.

Finish type	Powder Coated
Shape	Round,Square
Base type	Leg
Assembly required	Yes
Load capacity	66 lbs.
Global Trade Identification Number	00659814135226
Manufacturer	On-Stage
UPC	659814135226
Product Dimensions	78.74 x 41.91 x 19.05 cm; 6.92 kg
Finish types	Powder Coated
Batteries required	No

KSA8500 Deluxe Keyboard Tier (for Stacking Keyboards, Electric Pianos, Synths, and Organs on X-Style Stands, 66 lb Capacity, Adjustable Length, Arm Depth, Height, and Tilt, Metal, Black)

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