Shift type question

ERPNext
1

hello guys :

1 - is it possible to link more than shift to one biometric device or more
in local_config.py can i replace

# Configs updating sync timestamp in the Shift Type DocType
shift_type_device_mapping = [
    {'shift_type_name': ['Shift1'], 'related_device_id': ['test_1','test_2']}
]

with :

# Configs updating sync timestamp in the Shift Type DocType
shift_type_device_mapping = [
    {'shift_type_name': ['Shift1','shift2'], 'related_device_id': ['test_1']}
]

??

2 - in shift type form , is it possible to make the shift long 24 hours ?
from 7 am to 7 am the next day ??

if i did this :

start time == 07:00:00
end time == 06:59:00

Begin check-in before shift start time (in minutes) == 20
Allow check-out after shift end time (in minutes) == 20

does this solve the problem ???