For those of you who do not play on Aberration, it is super easy to get these guys on your map. You need to have the vanilla drake spawn on your map though. This will auto replace the Vanilla spawns with this one.
For Ragnarok, I have them spawn in the canyons. I find this to be a great habitat and the way I have it set up, the spawn amount is just right (for us).
Simply add this to your game.ini

ConfigAddNPCSpawnEntriesContainer=(NPCSpawnEntriesContainerClassString="DinoSpawnEntries_Ragnarok_Center_C",NPCSpawnEntries=((AnEntryName="",EntryWeight=0.050000,NPCsToSpawnStrings=("RockDrake_Character_BP_C"))),NPCSpawnLimits=((NPCClassString="RockDrake_Character_BP_C",MaxPercentageOfDesiredNumToAllow=0.050000)))

I believe on the wiki or another source you can get all the spawn containers for the official maps, so if you want to change where they spawn, you can. I use ArkServerManager for official maps and the dev kit for modded maps. You do NOT need to use ASM to change your inis or server or anything, you can just use it to easily get the ini set up.

Now, in order to tame these Rock Drakes, since they do not lay eggs, you will need a mod like "Immersive Tames" which is completely customizeable. Right now, my baby drakes have not needed nameless venom, but I just hatched em and I will be in bed when they ask for it. However, if you do need nameless venom, there are some good mods out there like "Kibble Station" by ODiN. Its super awesome and also a bit customizeable for what you can and cannot craft.
Also, you will need a saddle, you can add this into your game.ini
EngramEntryAutoUnlocks=(EngramClassName="EngramEntry_ShadowDrakeSaddle_C",LevelToAutoUnlock=75)
Yes, it says ShadowDrake, thats the Rock Drake :) It WILL require red gems which can be made in S+ grinder, I also believe you can adjust the crafting items, but I have not tampered with that yet :)

Have fun and good luck! (On a side note, if you use Better Dinos with this mod, make sure this mod is ABOVE that one or you may get Better Dinos rock drakes instead)

PS if you ask here, I may be able to get you the spawn zones you need for you :) I will try to pay attention to my messages.