Stable Legs for Desk
The legs you have may or may not provide the stability that you seek.  Hard to say.  The legs you link to probably would work fine for most purposes.  However, a skirt between the legs would improve the stability a good deal.  You can look at getting your own table skirt and legs using the calculator/chooser at Osborne Wood products here:  https://www.osbornewood.com/Skirt.aspx

We created a large counter height combination table and island using two Ikea wood countertops (round edges ripped off lengthwise, and halves mated together with pocket screws), two Ikea base cabinets and the 2 legs and matching skirts from Osborne.  It turned out really good and has ample stability.