Can model ends move in diagonal position if it not falling.

[KID55]

Like this

[Adran]

Im pretty sure it's a no. You can't ever legally have the model in that position. It should always have the base parallel to the ground/terrain it's on.

[solkan]

11 hours ago, KID55 said:

Like this

No.  From the most recent errata (with the reorganized falling rules):

Quote

If a model ever has less than 50% of its base supported by terrain or the table, that model falls and then con-tinues any remaining portion of its movement as normal.

When a model falls, its base is moved straight down (this does not expend any movement) until it is flat on terrain or the table, the model then suffers dam-age equal to half the distance it fell in inches (rounded down).

Granted, that first paragraph would probably read better if it said "and then continues any remaining portion of its movement as normal (if it fell during a move)."  But your picture is still going to be covered by the "if a model ever has less than 50% of its base supported" and the reorganized falling rules mean that even if you deployed a model in an unsupported position, the falling rules would cause it to fall into a supported position.