Something in the 20-25M range causes some pain for them with Bledsoe re-signed. It is an overpay and they may match and let Niko walk. Their issue is they likely can't pay Lopez what he will command and he has been important for them. They don't have full bird rights. They likely want to retain a stretch big and may want to allocate funds for Niko.
If we miss on Harris and Middleton rather than making a high toxic offer with Malcolm you might try to negotiate a contract and engage Milwaukee in a sign and trade for draft comp. $20M per year seems about right for Malcolm... $25-27M (his max starts at 27) is a definite overpay, but may not be so bad that you can't move him if you needed to. If they won't do a sign and trade you drop the toxic offer sheet in their lap.. can start it at $27M to inflict the most luxury tax pain possible and descend the yearly amount by 5% each year to take some edge off the later years.
Stealing FAs doesn't really get you the best value contract wise... Harris, middleton, Butler, kemba, all these guys will get max and might not quite be worth it.