Flexibility When Needed: Prefer suction mounts? Purchase ours separately (optimized for heavy devices). Why we chose to use 3M brackets: Our 4-channel dash cam is larger and heavier than standard models due to its advanced hardware. 3M bracket to assist static sticker installation can be more stable.The suction cup mount is able to fit the angle of the windshield. Therefore, in order to meet the needs of more customers, we have add the suction cup mounts Dash cam suction cup