Is the RackSolutions 2U Cobra Dry Slide Rail compatible with both 2-post and 4-post racks?

Yes, this rail kit supports both 2-post and 4-post racks.

What is the mounting depth range for the RackSolutions 2U Cobra Dry Slide Rail?

The mounting depth for 4-post racks is adjustable between 12" to 32" and for center mount 2-post racks, it is 3" to 6".

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RackSolutions 2U Cobra 115-A Dry Slide Rail for Dell - Compatible with 2U Dell PowerEdge Servers, Supports 2-Post and 4-Post Racks

SLIDING RACK RAIL ALTERNATIVE TO DELL READYRAILS: Compatible with 2U Dell PowerEdge servers from generations 11-15
SUPPORTS 2-POST AND 4-POST RACKS: Adjustable mounting depth of 12" to 32" for 4-post racks and 3" to 6" for center mount 2-post racks
HIGH-QUALITY DRY SLIDE RAILS: Dry slides offer greater durability and longevity compared to traditional ball-bearing rails
NO OEM RAIL KIT REQUIRED: Directly replaces the Dell rail kit, simplifying installation and providing easy access for maintenance
UNIVERSAL HOLE COMPATIBILITY: Fits square, round, and threaded hole racks, supporting L, C, and ? rack uprights