Newly bought tanks and how to use them

So during the sale I aquired myself the Ozelot, the Leo 2k and the Leo 2A4 which are now of course completely stock.

Which one of these can I play and which ones can I not play with eachother as there seem to be very little actual possible lineups for the later two 10.0 and 10.7?

The ozelot i can most likely use still in my 9.3 lineup of begleit, leo 1a5, t72 and gepard with the ozelot replacing said gepard.

Issue now stands is that I dont know if I can bring any of these to 10.0 and much less 10.7 but i feel like I also have no other choice.

Germany doesn’t have a lot to offer for a battle rating 10.0 line-up. But the Leopard 2K is enough to deal in a forced higher battle rsting line-up but as you said your vehicles are stock, I would exclusively play the Leopard 2K until research all the mobility modules and the APDS-FS ammunition.

It excels in mobility, armor and firepower. I would actually focus primarly on the Leopard 2K rather than the Leopard 2A4. When researched all the mobility modules you’ll be ok to force Leopard 2K in battle rating 10.7 to battle rating 11.7 matches with the Leopadd 2A4.

Leopard 2A4 has a good gun but not very good turret armor. furthermore in this BR range you’d meet lots of premium tanks like the M1128 Wolfpack, M1 KVT, M1A1 Click-Bait, RDF/LT, 2S38, T-72AV (TURMS-T), T-80UD, T-80U-E1, Challenger DS, Challenger 2 OES, Type 90 (B) “Fuji”, ZTZ96A (P), Al-Khalid-I, Centauro-RGO, Ariete Certezza, CV 90105, Christian II and Ra’am Sagol.
Most of these premiums are 11.3 and 11.7 so expect lots of full uptiers but since your cannon is good you can handle them.
You can shoot the lower front plate and driver port of the soviet and chinese tanks (you can also shoot the sides of the gun mantlet but I don’t recommend it since volumetric can mess you up sometimes), you can shoot the turret ring and driver port of the Abrams, you can shoot the hull of Leopard 2A4 and you’d be good to go.