Very simply put:
When you have a major sector within your armed forces under the name (Saudi Strategic Missile Force) and when this sector has a center and a private school, from where thousands graduate annually and when these forces have major bases that are more like underground cities that exceed the number of 5 and distributed over the regions of the Kingdom, do not ask about what is KSA missile preparation, but think how any regional enemy will survive the missile waves..
There are more than 50 launchers for DF-3.. the old but potent one against big installations and cities..
The DF-3 (CSS-2) was designed for a nuclear warhead and, therefore, has low accuracy. The unmodified version has a range/ payload of 2,700 km/2,200 kg. (The Military Balance 1989-90, International Institute for Strategic Studies, p. 219). range/payload are of 2,500 km/2,000 kg
DF-21 (CSS-5) solid-fuel, medium-range ballistic missiles _ the numbers are unknown (some reports say more than 400)
Class: Medium-Range Ballistic Missile (MRBM)Range: 2,150 km
Payload: Single warhead, 600 kg
Warhead: 250 or 500 kT nuclear, HE, submunitions
Range of DF-3 and DF-21
The Saudi arsenal is certainly diverse and consists of three more missiles
Here are a few missile bases:
U.S. Confirms Saudi Ballistic Missile Production
https://www.armscontrol.org/act/2019-07/news-briefs/us-confirms-saudi-ballistic-missile-production