I use this doorway barre. I have had good luck with it, even pulling on it to sit in chair position.
lb2designs Porté Dance Portable Ballet Barre https://www.amazon.com/dp/B0888FMK45/ref=cm_sw_r_apan_glt_i_43XTJ3PKZH1XW636KM8N
For Empower I just use a step stool. The Spri platform that they use in studio is really hard to find. I once found it online but it was over $100.