Replacing battery without battery adhesive strips, ok or not?

I've already bought a new battery and about to replace it into my Huawei Mate 8. I watched the video showing how to replace the battery from Youtube which mentioned that once taking out the old battery, I need to place two adhesive strips to stick the new battery into the tray. However, I don't have the strips. My question is "Can I just ignore it, and continue replacing the new battery without the strips, or I should buy stripes to make sure everything is good in the long run.

thank you.