Ugh, you made me look at NASA requirements documents.
NASA HLS-RQMT-001 HUMAN LANDING SYSTEM (HLS) REQUIREMENTS DOCUMENT states
HLS-R-0071 Landing Site Vertical Orientation
The HLS shall provide vertical orientation of 0 to 8° (threshold) and 0 to 5° (goal) from
local vertical for surface operations.
Rationale: The HLS must support all post-landing crew ...