If all of your operating systems are listed above, then it should be safe to install the boot loader to your primary drive (UEFI partition/boot record). When your computer boots, you will be able to choose to load one of these operating systems or the newly installed Debian system.
Ma yella meṛṛa inagrawen-inek·inem n wammud ttwabdaren-d ddaw-a, ilqa ad tḍemneḍ asebded n usalay n usenker ɣef yimeɣri-inek·inem agejdan (aḥric UEFI/asekles n usenker). Mi ara yekker uselkim-inek·inem, tzemreḍ ad tferneḍ ad d-tsaliḍ yiwen se yinagrawen-a n wammud neɣ anagraw n Debian i yettusbedden melmi kan.