That's right. I had a pair of apistos and a pair of bolivian rams in an 80cm long 125 litre tank and they were OK together. With your tank having a bigger footprint, you should have room for a trio (1m 2f) of apistos.
But you could also have a small group of bolivian rams instead of 2 kinds of bottom dwelling cichlid. My tank is just too small for that. In a big enough tank, they can be kept in groups of 6 to 8.
If you'd rather have apistos as well rather than a lot of fish the same, the most common ones in the shops are Apistogramma cacatuoides (cockatoo cichlid) and A. agassizi. But I have also seen A. borelli, A. trifasciata and A. panduro/nijsseni (very similar fish, often named as the other one in shops). All look pretty boring in shop tanks, but the females especially will colour up when settled in your tank. As do bolivian rams.
It is very difficult to sex bolivian rams. The only sure fire way is from the breeding tubes. Males tend to have elongated rays at the front of the dorsal fin, tail edges and pelvic fins - but young males won't have grown them yet. The anal fin in males is long enough to reach past the start of the caudal peduncle, but again, juvenile males' fins won't have grown yet. Females have rounded bellies all the way from the mouth to the tail, whereas males' bellies flatten off towards the tail. But malnutrition is all too common in shop tanks and emaciated females' bellies look like males. Like with angels, the recommended is to buy a group, let them pair off then sell on the 'spare' ones. Some shops will take them back as they can sell them again as proved pairs for more money.