Like blade im a carpenter/builder...your house slab is 4" thick (100mm/10cm)...thats it.!!..unless youre lucky enough to have fluked drilling over a footing beam (a standard basic raft slab is basically a grid of 300x300 beams/trenches at 3.0 metre intervals in both directions (looks like 3.0 metre squares if you like) with a 100mm thick slab over the top--all poured integrally (at the same time). So unless you fluke drilling into one of those beams you'll hit dirt pretty quick...!!
& thats assuming its a raft...if its a waffle you might get 110mm out of it, with 150mm beams at closer intervals....rite enough of that...
Id be using 50mm galv dynabolts--if you put them in correct you will NOT get that safe up with any in house conceivable leverage tools or force.
& its NOT hard to do--just drill the hole 5mm deeper than the length of the bolt up to the underside of the nut (when the nut is turned on the stud half its own full depth/so only half the thickness of the nut is on the thread).
Put it in yourself mate...all yoiu need is a drill, 10mm masonry drill bit, a pencil & a small spanner or ratchet/socket...if youre really worried about it have a 12mm masonry drill bit & some 12mm dynabolts close by incase you miss a marked hole.
If youre more worried & for added security, drill extra holes through the safe & put the dynabolts down with some big washers--or through some plate steel off-cuts with 10mm holes in them...(if you do this, just add this thickness to the depth of the hole you drill).
Hell ill even talk you through it over the fone (we could do video call just in case you are as incompetent as you say...
)
If they are getting that much money to install safes over there, maybe i should come over & start a business--i always thought you New South Welshman had too much coin...!
--thats a legal licence to print money...!!!...sheepers, all that for 15 mins work & thats including getting the tools out & cleaning up while drinking a coffee your missus made me...!!
Ya better be careful mate, im single & good looking
so i might steal your missus when im installing your safe while you're at work...
Seriously, its easy...do it yourself...pm me if you want verbal talk through mate...
Edit:i just read Scotts input & putting in a corner is a good idea, but i figured my post was too long as it was so i didnt add that...if its indoors, just screw into corner studs if timber frame...
10mm dynabolts are 50mm long, 12mm dynabolts are 60mm long...take your pick--if installed correctly neither will be coming up...!!
The man who knows everything, doesnt really know everything...he's just stopped learning...