IKEA has the white adjustable legs. And you can get a butcher block counter from anywhere.
For standing option we got this for my wife. Had it for 1.5 years and its been great for her.
TechOrbits Standing Desk Converter - 32 Inch Particle Board, Adjustable Height Sit to Stand Up Desk Riser for Home Office - Computer, Laptop & Dual Monitor Workstation - White https://www.amazon.com/dp/B0828C5FRJ/ref=cm_sw_r_apan_glt_i_HHYXZM46C77DTPXW7ERJ?_encoding=UTF8&psc=1
https://www.amazon.com/gp/product/B0828C5FRJ
This is what I'm using right now but I would recommend something sturdier to support a G9.