I have currently 2 Montis in my tank.
German Blue Digitata that has amazing colour and growth. And BS crazy orange neon glowing one.
Checked tank last night to see if there were any nudis in tank after having an issue before . Found 7 visible ones at base of German blue colony, none on BS piece. I didn't even bother dipping the whole thing last night, just snipped off three 3" branches from top and tossed the rest. Dipped them and set on a frag rack on magfloat to be monitored.
I did try the new Bayer on the branches I broke off. They looked cleaned, but I even brushed them with a toothbrush gently incase of eggs, but all nudis were right at base of colony so check there.