3 lbs / 1.3 kg will be approximately 1 rack of untrimmed 12 – 13 bone back / spare rib type ribs or about 2 trimmed baby back racks.
If you want to double the recipe, you can fit about 5 – 6 lbs / 2.25 – 2.72 kg of ribs into the insert of a 6 Quart Instant Pot model. You will, however, have to pack them tightly, including down the sides of the insert rather than having them all on the rack, making sure not to get too close to the Max Fill line. Use the same amount of broth or water, double the glaze recipe and increase the cook time to 50 minutes total at high pressure, letting the ribs rest for 20 minutes in the turned off Instant Pot before quick releasing and glazing.
Find it online: https://meatified.com/sticky-honey-garlic-instant-pot-ribs/