systemd-boot is the standard bootloader for Archlinux and by extension ArchLabs. Personally I prefer it to grub and other offerings (other than efistub boot). It can handle multi-boot, finds other bootable systems automatically, and is configured automatically with each update (no need to run grub-update manually).
Our installer lets you pick from most of the available options for bootloaders so if something is missing please let me know.
There is currently no way to avoid installing one of the bootloaders, if you want multiple systems setup then pick a bootloader and don’t wipe your boot partition, it will find them. Otherwise install AL first then overwrite our bootloader with one from another install.