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Default DHCPD configuration must be changed in order to allow booting unknown UEFI hosts to something like:

option arch code 93 = unsigned integer 16; # RFC4578

class "pxeclients" {
  match if substring (option vendor-class-identifier, 0, 9) = "PXEClient";
  next-server 10.0.0.1;
  if option arch = 00:06 {
    filename "grub2/bootia32.efi";
  } else if option arch = 00:07 {
    filename "grub2/bootx64.efi";
  } else if option arch = 00:09 {
    filename "grub2/bootx64.efi";
  } else {
    filename "pxelinux.0";
  }
}