For me, it really depends....
If the amazons were as all as powerful as Diana in terms of speed, strength, extended senses, jumping ability and flight (with special eagle armor for each Amazon), then I want PI to be an ancient put powerful civilization that is isolated and rarely interacts with the outside world. I want PI to be in another dimension that is obviously not accessible just to anybody - still protected by chaotic in turbulent weather like in Perez's run, and once you get there, PI is still protected by a mystical spell through the combined powers of the Olympian Gods (regardless if they are around or not) that no alien/modern technological projectiles/energy fire can destroy the forests surrounding PI and its architecture. Invaders can fire their weapons yes and harm the inhabitants, but not the environment (hence, making PI a prized location conquered by evil beings with armies. The amazons can also only fly if they have their eagle armor on that is made from Amazonium, This metal is a unique, magical metal that can only be manipulated by the amazons by mind control, and each of them carries two (which will be their bracelets) and their tiaras In battle, they transform these metals into a armor, and any weapon for their choice. If transformed into a bow, it can fire eldritch bolts. Lastly, the amazons also have bred and tamed many of the creatures of myth in Greek mythology for land, water and air travel for added convenience and as aids for battle; each of these creatures are unique; some are more immortal than others; can regenerate parts like hydras, etc. Also, Amazons can venture out of PI too long or they lose their immortality and start aging. This way, PI is formidable, yet ancient, and can't be used easily as cannon fodders of the DCU, plus there won't be dozens of WW running around outside PI.
However, if they are just perhaps just half the strength of WW, and can't fly. Then yes, I would like them to develop alien/magical tech all based on Amazonium, with a modern city on the shores surrounding PI, but in the core of the city is the ancient city of Themysicira, still protected by a powerful indestructible spell, wherein the amazons use the for ancient rituals and social gatherings.
I like the first one better; much more grand looking, unique, and formidale and make up for better interesting battles with high tech villains.